JPH0535202Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a pressure holding device in a flexible pressure vessel, and more specifically, the invention relates to a pressure holding device in a flexible pressure vessel. , relates to a pressure holding device in a flexible pressure vessel that maintains the pressure within the flexible pressure vessel constant and effectively prevents changes in volume even when external conditions such as external temperature change. .

[Conventional technology]

Conventionally, when a flexible pressure container such as a pressure-resistant rubber bag used at the sea surface, seawater, or underwater is filled with an incompressible fluid such as water and pressurized to maintain its shape, external pressure,
The problem is that when external conditions such as external temperature change, the volume of the sealed internal fluid changes, resulting in damage due to an increase in volume due to pressure changes, or collapse due to a decrease in volume change. It was hot.

[The problem that the idea aims to solve]

In order to prevent the above-mentioned changes in the flexible pressure vessel, the flexible pressure vessel should be equipped with a device that has power for pressurization, and if the internal pressure of the flexible pressure vessel decreases, it will be pressurized, and if the internal pressure increases, it will not be compressed. This change can be prevented by releasing the fluid, but power for pressurization is always required, and therefore, in places where power for pressurization is not available, it is difficult to keep the pressure of the flexible pressure vessel constant. If it is not possible to do so, and if it is used, there are problems in that it becomes larger and costs increase.

This idea was devised by focusing on such conventional problems, and has a simple structure that can always maintain the pressure inside the flexible pressure vessel constant even if the surrounding conditions such as external pressure and temperature change. It is an object of the present invention to provide a pressure holding device for a flexible pressure vessel that is capable of effectively preventing damage to the flexible pressure vessel.

[Means to solve the problem]

This invention which achieves the above object is a pressure holding device in a flexible pressure vessel which is connected to a flexible pressure vessel sealed with an incompressible pressurized fluid, the pressure holding device being a cylinder having a chamber communicating with the chamber, and a cylinder disposed within the cylinder so as to be movable back and forth in a direction to press the incompressible pressurized fluid flowing into the chamber, and constantly press the incompressible pressurized fluid. a piston biased in a direction with a force corresponding to the pressure within the flexible pressure vessel, and the cylinder is configured to
The gist of the present invention is to include an opening that can constantly introduce pressure equivalent to the external pressure applied to the flexible pressure vessel from the side opposite to the chamber side.

[Effect]

This device is constructed as described above, and when the internal pressure of the flexible pressure vessel decreases due to changes in external temperature, etc., the incompressible pressurized fluid is pressed by the piston of the pressure holding device, pressurizing the inside of the flexible pressure vessel. When the internal pressure of the flexible pressure vessel decreases, the piston of the pressure holding device retreats and incompressible pressurized fluid flows into the chamber of the cylinder, releasing the pressure within the flexible pressure vessel. In addition, even if the external pressure applied to the flexible pressure vessel changes,
Since the external pressure applied to the piston of the pressure holding device changes similarly, the volume of the flexible pressure vessel is controlled so as to be kept constant at all times.

〔Example〕

Embodiments of this invention will be described below based on the accompanying drawings.

FIG. 1 shows a cross-sectional view of a flexible pressure vessel 1 filled with an incompressible pressurized fluid W and a pressure holding device 2 according to this invention. Incompressible pressurized fluid W is enclosed.

The flexible pressure vessel 1 communicates with a pressure holding device 2 via a pipe 4. Further, a supply port 3 for incompressible pressurized fluid W is connected to the pipe 4 via a branch pipe 5, and a valve 6 is provided between the supply port 3 and the branch pipe 5.

The pressure holding device 2 includes a cylinder 7 having a chamber 12 that communicates with the flexible pressure vessel 1 via a pipe 4, and presses an incompressible pressurized fluid W flowing into the chamber 12 into the cylinder 7. and a piston 8 which is disposed so as to be movable back and forth in the direction of pressing the incompressible pressurized fluid W at all times and is biased by a spring 9 with a force P1 corresponding to the pressure within the flexible pressure vessel. has been done.

The biasing pressure P1 of the piston 8 that keeps the pressure P inside the flexible pressure vessel 1 constant is approximately the same pressure as the pressure P inside the flexible pressure vessel 1 (P≒P1).
is set to .

Therefore, if the internal pressure P of the flexible pressure vessel 1 falls below the set pressure, the biasing pressure P1 of the spring 9 of the piston 8 of the pressure holding device 2 and the external pressure applied to the pressure receiving area of the piston 8 will cause incompressible pressurization. The fluid W is pushed out to pressurize the flexible pressure vessel 1, and when the internal pressure P rises above the set pressure, the incompressible fluid W is pumped into the cylinder 7 of the pressure holding device 2 against the biasing pressure P1 of the piston 9. Let it be released.

Thereby, the pressure P of the flexible pressure vessel 1 is controlled to be kept constant at all times, and changes in the flexible pressure vessel 1 are effectively prevented.

Further, the cylinder 7 is provided with an opening 10 through which pressure equivalent to the external pressure applied to the flexible pressure vessel 1 can be constantly introduced to the piston 8 from the space 10 on the side opposite to the chamber 12. It is being Therefore, even if the external pressure applied to the flexible pressure vessel 1 changes, the external pressure applied to the piston 8 of the pressure holding device 2 will change as well, so the volume of the flexible pressure vessel 1 will always remain constant despite changes in external pressure. It is now possible to control the temperature so that it is maintained at

FIG. 2 shows another embodiment of the pressure holding device 2, and this pressure holding device 2a includes a first cylinder 17 having a chamber 16 communicating with the flexible pressure vessel 1 via a pipe 4. and flexible pressure vessel 1
A first piston 18 that biases the incompressible pressurized fluid W flowing into the chamber 16 in the first cylinder 17 so as to maintain a constant pressure therein; It is composed of a second cylinder 19 that provides P1 and an accumulator 20.

The tip of the rod 18a of the first piston 18 fitted in the first cylinder 17 is fitted into one end side of the second cylinder 19 housed in the proximal end side of the first cylinder 17. cylinder 1
The accumulator 20 is connected to the other end of the fuel cell 9 .

This accumulator 20 has a cylinder 21
A secondary incompressible pressurized fluid W1 and a high-pressure air bag 22 are housed inside the air bag, and the high-pressure air bag 22 is connected to a pressure supply source (not shown) via a valve 23.

Further, the first cylinder 17 has an opening 25 through which pressure equivalent to the external pressure applied to the flexible pressure vessel 1 can be freely introduced into the first piston 18 from the side opposite to the chamber 16 at any time. When high-pressure air A is supplied into the high-pressure air bag 22, the high-pressure air bag 22 expands and pushes out the secondary incompressible pressurized fluid W1 housed in the cylinder 21. Secondary incompressible pressurized fluid W1
The first piston 18 is urged via the rod 18a by the pressure of The liquid is supplied into the pressure vessel 1. Conversely, when the pressure in the flexible pressure vessel 1 exceeds the set pressure, the first piston 18, which is urged by the high-pressure air A via the secondary incompressible pressurized fluid W1, is pushed back, It is configured to store and hold the incompressible pressurized fluid W in the chamber 16 within the first cylinder 17 .

Therefore, the pressure P2 of the high-pressure air A supplied into the high-pressure air bag 22 is set to approximately the same pressure (P≒P2) as the pressure P inside the flexible pressure vessel 1, and the flexible pressure The container 1 is configured to supply or discharge incompressible pressurized fluid W in accordance with pressure fluctuations within the container 1 to maintain a constant pressure at all times.

By configuring as described above, there is no need to provide a device with special pressurizing power to the flexible pressure vessel 1, and therefore, it is possible to implement it without being limited to the place of use. be.

[Effect of the invention]

As described above, this invention is a pressure holding device in a flexible pressure vessel that is connected to a flexible pressure vessel sealed with an incompressible pressurized fluid, the pressure holding device being connected to the flexible pressure vessel. A cylinder having a communicating chamber, and a cylinder disposed within the cylinder so as to be movable in a direction that presses an incompressible pressurized fluid flowing into the chamber, and a direction that constantly presses the incompressible pressurized fluid. and a piston urged with a force corresponding to the pressure within the flexible pressure vessel, and the cylinder is configured to apply pressure to the flexible pressure vessel from a side opposite to the chamber side with respect to the piston. Since it has an opening that can constantly introduce pressure equal to the pressure, the following excellent effects can be achieved.

a The incompressible pressurized fluid flowing into the chamber communicating with the flexible pressure vessel is constantly pressed by a piston with a force corresponding to the pressure inside the flexible pressure vessel, so the flexibility changes due to changes in external temperature. Even if the internal pressure of the pressure vessel changes, the pressure can be absorbed, and the internal pressure of the flexible pressure vessel can be controlled to be kept constant. Therefore, it is possible to control the volume change of the flexible pressure vessel which repeatedly occurs due to external temperature changes, and effectively prevent damage or collapse of the flexible pressure vessel.

b From the opening of the cylinder, pressure equivalent to the external pressure applied to the flexible pressure vessel is constantly applied to the piston from the side opposite to the chamber side, so even if the external pressure applied to the flexible pressure vessel changes, the pressure will not change. Since the external pressure applied to the piston of the holding device changes in a similar manner, it is possible to further suppress changes in the volume of the flexible pressure vessel, and further effectively prevent breakage and collapse of the flexible pressure vessel. In particular, this method is extremely effective for flexible pressure vessels made of flexible materials that are directly exposed to environments in which the peripheral conditions change, and whose volume easily changes due to external pressure.

c. Changes in volume of flexible pressure vessels can be further suppressed, and breakage and collapse of flexible pressure vessels can be more effectively prevented, thereby extending the lifespan of flexible pressure vessels used in environments where peripheral conditions change. can be kept for longer.

d) Since a power source for operation is not required and the volume change of the flexible pressure vessel can be suppressed with a simple structure, the installation location is not limited and it can be used in an extremely wide range.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a flexible pressure vessel filled with an incompressible pressurized fluid and a pressure holding device according to this invention, and Fig. 2 is a sectional view showing another embodiment of the pressure holding device. be. 1... Flexible pressure vessel, 2... Pressure holding device,
3... Supply port, 7... Cylinder, 8... Piston, 9... Spring, W... Incompressible pressurized fluid, Wa... Pressurized fluid, P... Pressure in flexible pressure vessel, P1 ...Biasing pressure.

Claims (1)

[Utility Model Registration Claim] A pressure retaining device within a flexible pressure vessel connected to the flexible pressure vessel containing a non-compressible pressurized fluid, said pressure retaining device comprising: a cylinder with a chamber connected to the flexible pressure vessel, and a piston arranged within the cylinder capable of moving back and forth in a direction to pressurize the non-compressible pressurized fluid flowing into the chamber, and biased with a force corresponding to the pressure within the flexible pressure vessel in the direction to press the non-compressible pressurized fluid at all times, said cylinder having an opening capable of constantly introducing a pressure equivalent to the external pressure applied to the flexible pressure vessel from the side opposite the chamber to the piston. A pressure retaining device within a flexible pressure vessel, characterized in that the cylinder has an opening capable of constantly introducing a pressure equivalent to the external pressure applied to the flexible pressure vessel from the side opposite the chamber to the piston.